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Arachnids are arthropods in the class Arachnida (/ ə ˈ r æ k n ɪ d ə /) of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons. [2] Adult arachnids have eight legs attached to the cephalothorax.
Mites are tiny members of the class Arachnida; most are in the size range 250 to 750 μm (0.01 to 0.03 in) but some are larger and some are no bigger than 100 μm (0.004 in) as adults. The body plan has two regions , a cephalothorax (with no separate head) or prosoma, and an opisthosoma or abdomen.
Paintings of Araneus angulatus from Svenska Spindlar of 1757, the first major work on spider taxonomy. Spider taxonomy is the part of taxonomy that is concerned with the science of naming, defining and classifying all spiders, members of the Araneae order of the arthropod class Arachnida, which has more than 48,500 described species. [1]
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Chelifer cancroides is the species most commonly found in homes, where it is often observed in rooms with dusty books. [1] There, the tiny animals (2.5–4.5 mm or 0.10–0.18 in) can find their food such as booklice and house dust mites. They enter homes by riding insects larger than themselves, or are brought in with firewood.
Tetrapulmonata is a non-ranked supra-ordinal clade of arachnids.It is composed of the extant orders Uropygi (whip scorpions), Schizomida (short-tailed whip scorpions), Amblypygi (tail-less whip scorpions) and Araneae (spiders).
Gromov, A.V. 1998: A new family, genus and species of scorpions (Arachnida, Scorpiones) from southern Central Asia. Zoologicheskii zhurnal, 77(9): 1003–1008. [not seen, in Russian with English summary, English translation in Russian journal of zoology, 2: 409–413.
Lycosoidea is a clade or superfamily of araneomorph spiders.The traditional circumscription was based on a feature of the eyes. The tapetum is a reflective layer at the back of the eye, thought to increase sensitivity in low light levels.